Small population sizes, restricted geographical ranges, predators and habitat degradation all contribute to the vulnerability of mainland New Zealand penguin species.

Predators

Unlike flying birds, which moult and replace their feathers gradually so that they can continue to fly, penguins moult all of their feathers at once. This enables them to go back out to sea without ‘leaks’ in their waterproof insulation. Moulting is a stressful time for penguins, and during this two to five week period in late summer birds may look sick and ragged. They are also highly vulnerable to predators at this time.

The main land-based predators are stoats, ferrets, rats, dogs, and feral cats.

Skua (a large gull-like bird) and giant petrels are the penguin’s only avian predators and will both take poorly guarded eggs and chicks. Skua are also capable of killing adult blue penguins.

Habitat loss and change in climate

The yellow-eyed penguin is the New Zealand species most affected by habitat loss. A forest or shrubland nesting species, the yellow-eyed has come under pressure as forest has been replaced with pasture.

A slight warming of sea temperatures in the past 50 years is thought to have forced vital food species such as krill further south, with a subsequent impact on several penguin species.

Fishing and human disturbance

Fisheries by-catch of penguins, and entanglement in discarded nylon fishing lines are also threats to penguins.

Spills of light fuel oil from fishing boats and the emptying of engine-room bilges. The oil coats penguins’ feathers and prevents them from insulating properly. Fortunately, these incidences are rare around New Zealand.

Penguins are also highly susceptible to human disturbance when nesting.

Keep our penguins safe

Leave penguins alone. Usually scruffy birds are simply moulting.

Put your dog on a leash around penguin areas.

Keep your dog away from nests, and warn others nearby of the location.

Donate your time or money to help penguin protection groups, such as the Yellow-eyed Penguin Trust and Forest & Bird.

Download a rhyme card to remind you how to keep our wildlife safe around your dog: